package demo;

public class Letter {
	public static String addHeader(String text){
		return "Dear Wife "+ text;
	}
	
	public static String addFooter(String text){
		return text+ " From zhouyang  2017-02-23";
	}
	
	public static String checkSpelling(String text){
		return text.replaceAll("labda", "Lambda");
	}
}
